[ARC5] command set bench psu

[Mike Everette]

When the Type 12 VHF receivers are right, they are amazing.  Great sensitivity and the stability seems good, but then again the IF is very wide.

73

Mike
W4DSE



--- On Fri, 1/11/13, J. Forster <jfor at quikus.com> wrote:

> From: J. Forster <jfor at quikus.com>
> Subject: Re: [ARC5] command set bench psu
> To: "Mike Hanz" <aaf-radio-1 at aafradio.org>
> Cc: "ARC-5" <arc5 at mailman.qth.net>
> Date: Friday, January 11, 2013, 6:49 PM
> I fully understand Mike. I'd just not
> seen the unit in my WW II stuff info.
> 
> I've no interest in Type 12 stuff. BTW, it seems very few
> other people do
> either- the stuff just goes begging. I mistakenly bought a
> big boxfull
> about 30 years ago for about $5, and it's still sitting.
> 
> -John
> 
> ==========
> 
> 
> 
> > They are indeed, John, but the WWII sets have about the
> same power
> > requirements, so while the manual may not say ARA/274N
> or the like, it's
> > a perfect supply for them. It's a neat little supply
> that doesn't take
> > up much space on your bench, and is especially useful
> if about all you
> > service are WWII aircraft receivers of various
> types.  It will power a
> > BC-348 about as well as the command sets, for example.
> >
> > On 1/11/2013 5:38 PM, J. Forster wrote:
> >> In looking at the pics, it seems they might be
> post-WWII and designed to
> >> service the Type 12 stuff.
> >> ===========
> >>> Thanks for the good information!
> >>>
> >>> I got a couple of those; I never realized they
> were for the
> >>> ARC-5/SCR-274N
> >>> and later type receivers! I picked up 2 at a
> hamfest a long time ago
> >>> for
> >>> $25
> >>> for both. I used them as general bench
> supplies, for the plate voltage.
> >>> I
> >>> never used the 24VDC output...
> >>> Since they haven't been used for a while, it's
> time to dust them off
> >>> and
> >>> replace the rectifiers and mod them per Mike!
> >>>
> >>> 73, Meir WF2U
> >>> Landrum, SC
> >>>
> >>> -----Original Message-----
> >>> From: arc5-bounces at mailman.qth.net
> >>> [mailto:arc5-bounces at mailman.qth.net]
> >>> On
> >>> Behalf Of Mike Hanz
> >>> Sent: Friday, January 11, 2013 4:35 PM
> >>> To: Darryl Sage
> >>> Cc: ARC5 at mailman.qth.net
> >>> Subject: Re: [ARC5] command set bench psu
> >>>
> >>> On 1/11/2013 2:52 PM, Darryl Sage wrote:
> >>>> I saw a command set bench psu . i had to
> have it more mony than
> >>>> brains.I
> >>>> guess i can retire a few dynos  I have
> never seen one before are they
> >>>> rare?
> >>>> darryl    ve3cpo
> >>> I'm assuming that you are referring to
> >>> http://www.ebay.com/itm/ARC-5-Power-Supply-SCR-274N-Receiver-OEM-/1409024993
> >>> 34
> >>>
> >>>
> >>> I've had a few cycle through here.  I've
> used them for a while, then
> >>> pass them on to someone who's wanting
> one.  They have some drawbacks,
> >>> one of which you can see in the photos - the
> voltages tend to be on the
> >>> high side rather than the low side as we are
> more and more trying to
> >>> provide for our dwindling supply of command
> sets.  The selenium
> >>> rectifier used for the low voltage supply
> should be replaced before it
> >>> replaces you, and the HV bridge diodes could be
> replaced by four modern
> >>> HV diodes.
> >>>
> >>> You can fix the voltages with a bucking
> transformer, but if I was
> >>> keeping one, I'd put in a 6082 (24v filament)
> series regulator on a
> >>> 3"x3" outboard chassis on the back, and design
> the circuit so that the
> >>> HV switch steps started at maybe 50v and ended
> up around 220v. There
> >>> are
> >>> plenty of those circuits in the manuals. 
> Then it would be pretty
> >>> useful.  It's a shame the nifty cable with
> the dynamotor connector was
> >>> retained by the seller, but you can cobble one
> up fairly easily, if not
> >>> as elegant looking.
> >>>
> >>> Congratulations on your purchase - I'm sure
> you'll enjoy using it!
> >>>
> >>> 73,
> >>>    - Mike
> >
> >
> 
> 
> ______________________________________________________________
> ARC5 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/arc5
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:ARC5 at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>